author | Florian Westphal <fw@strlen.de> |
Thu, 09 Apr 2009 12:07:21 +0200 | |
changeset 2 | d1f6d8b6f81c |
parent 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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/* |
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* include/linux/buffer_head.h |
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* |
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* Everything to do with buffer_heads. |
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*/ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef _LINUX_BUFFER_HEAD_H |
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#define _LINUX_BUFFER_HEAD_H |
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|
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#include <linux/types.h> |
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#include <linux/fs.h> |
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#include <linux/linkage.h> |
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#include <linux/pagemap.h> |
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#include <linux/wait.h> |
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#include <asm/atomic.h> |
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#ifdef CONFIG_BLOCK |
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enum bh_state_bits { |
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BH_Uptodate, /* Contains valid data */ |
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BH_Dirty, /* Is dirty */ |
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BH_Lock, /* Is locked */ |
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BH_Req, /* Has been submitted for I/O */ |
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BH_Uptodate_Lock,/* Used by the first bh in a page, to serialise |
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* IO completion of other buffers in the page |
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*/ |
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BH_Mapped, /* Has a disk mapping */ |
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BH_New, /* Disk mapping was newly created by get_block */ |
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BH_Async_Read, /* Is under end_buffer_async_read I/O */ |
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BH_Async_Write, /* Is under end_buffer_async_write I/O */ |
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BH_Delay, /* Buffer is not yet allocated on disk */ |
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BH_Boundary, /* Block is followed by a discontiguity */ |
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BH_Write_EIO, /* I/O error on write */ |
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BH_Ordered, /* ordered write */ |
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BH_Eopnotsupp, /* operation not supported (barrier) */ |
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BH_Unwritten, /* Buffer is allocated on disk but not written */ |
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BH_Quiet, /* Buffer Error Prinks to be quiet */ |
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BH_PrivateStart,/* not a state bit, but the first bit available |
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* for private allocation by other entities |
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*/ |
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}; |
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#define MAX_BUF_PER_PAGE (PAGE_CACHE_SIZE / 512) |
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|
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struct page; |
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struct buffer_head; |
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struct address_space; |
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typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate); |
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|
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/* |
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* Historically, a buffer_head was used to map a single block |
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* within a page, and of course as the unit of I/O through the |
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* filesystem and block layers. Nowadays the basic I/O unit |
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* is the bio, and buffer_heads are used for extracting block |
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* mappings (via a get_block_t call), for tracking state within |
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* a page (via a page_mapping) and for wrapping bio submission |
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* for backward compatibility reasons (e.g. submit_bh). |
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*/ |
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struct buffer_head { |
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unsigned long b_state; /* buffer state bitmap (see above) */ |
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struct buffer_head *b_this_page;/* circular list of page's buffers */ |
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struct page *b_page; /* the page this bh is mapped to */ |
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|
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sector_t b_blocknr; /* start block number */ |
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size_t b_size; /* size of mapping */ |
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char *b_data; /* pointer to data within the page */ |
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|
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struct block_device *b_bdev; |
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bh_end_io_t *b_end_io; /* I/O completion */ |
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void *b_private; /* reserved for b_end_io */ |
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struct list_head b_assoc_buffers; /* associated with another mapping */ |
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struct address_space *b_assoc_map; /* mapping this buffer is |
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associated with */ |
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atomic_t b_count; /* users using this buffer_head */ |
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}; |
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|
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/* |
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* macro tricks to expand the set_buffer_foo(), clear_buffer_foo() |
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* and buffer_foo() functions. |
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*/ |
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#define BUFFER_FNS(bit, name) \ |
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static inline void set_buffer_##name(struct buffer_head *bh) \ |
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{ \ |
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set_bit(BH_##bit, &(bh)->b_state); \ |
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} \ |
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static inline void clear_buffer_##name(struct buffer_head *bh) \ |
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{ \ |
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clear_bit(BH_##bit, &(bh)->b_state); \ |
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} \ |
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static inline int buffer_##name(const struct buffer_head *bh) \ |
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{ \ |
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return test_bit(BH_##bit, &(bh)->b_state); \ |
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} |
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|
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/* |
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* test_set_buffer_foo() and test_clear_buffer_foo() |
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*/ |
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#define TAS_BUFFER_FNS(bit, name) \ |
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static inline int test_set_buffer_##name(struct buffer_head *bh) \ |
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{ \ |
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return test_and_set_bit(BH_##bit, &(bh)->b_state); \ |
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} \ |
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static inline int test_clear_buffer_##name(struct buffer_head *bh) \ |
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{ \ |
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return test_and_clear_bit(BH_##bit, &(bh)->b_state); \ |
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} \ |
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|
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/* |
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* Emit the buffer bitops functions. Note that there are also functions |
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* of the form "mark_buffer_foo()". These are higher-level functions which |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* do something in addition to setting a b_state bit. |
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114 |
*/ |
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115 |
BUFFER_FNS(Uptodate, uptodate) |
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116 |
BUFFER_FNS(Dirty, dirty) |
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117 |
TAS_BUFFER_FNS(Dirty, dirty) |
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118 |
BUFFER_FNS(Lock, locked) |
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119 |
BUFFER_FNS(Req, req) |
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120 |
TAS_BUFFER_FNS(Req, req) |
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121 |
BUFFER_FNS(Mapped, mapped) |
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122 |
BUFFER_FNS(New, new) |
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123 |
BUFFER_FNS(Async_Read, async_read) |
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124 |
BUFFER_FNS(Async_Write, async_write) |
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125 |
BUFFER_FNS(Delay, delay) |
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126 |
BUFFER_FNS(Boundary, boundary) |
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BUFFER_FNS(Write_EIO, write_io_error) |
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128 |
BUFFER_FNS(Ordered, ordered) |
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129 |
BUFFER_FNS(Eopnotsupp, eopnotsupp) |
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130 |
BUFFER_FNS(Unwritten, unwritten) |
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131 |
|
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132 |
#define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK) |
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#define touch_buffer(bh) mark_page_accessed(bh->b_page) |
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134 |
|
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135 |
/* If we *know* page->private refers to buffer_heads */ |
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#define page_buffers(page) \ |
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137 |
({ \ |
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138 |
BUG_ON(!PagePrivate(page)); \ |
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139 |
((struct buffer_head *)page_private(page)); \ |
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140 |
}) |
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141 |
#define page_has_buffers(page) PagePrivate(page) |
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142 |
|
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143 |
/* |
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144 |
* Declarations |
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145 |
*/ |
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146 |
|
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147 |
void mark_buffer_dirty(struct buffer_head *bh); |
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148 |
void init_buffer(struct buffer_head *, bh_end_io_t *, void *); |
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149 |
void set_bh_page(struct buffer_head *bh, |
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150 |
struct page *page, unsigned long offset); |
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151 |
int try_to_free_buffers(struct page *); |
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152 |
struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size, |
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153 |
int retry); |
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154 |
void create_empty_buffers(struct page *, unsigned long, |
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155 |
unsigned long b_state); |
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|
156 |
void end_buffer_read_sync(struct buffer_head *bh, int uptodate); |
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157 |
void end_buffer_write_sync(struct buffer_head *bh, int uptodate); |
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158 |
|
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159 |
/* Things to do with buffers at mapping->private_list */ |
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|
160 |
void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode); |
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161 |
int inode_has_buffers(struct inode *); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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162 |
void invalidate_inode_buffers(struct inode *); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
163 |
int remove_inode_buffers(struct inode *inode); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
164 |
int sync_mapping_buffers(struct address_space *mapping); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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|
165 |
void unmap_underlying_metadata(struct block_device *bdev, sector_t block); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
166 |
|
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|
167 |
void mark_buffer_async_write(struct buffer_head *bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
168 |
void invalidate_bdev(struct block_device *); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
169 |
int sync_blockdev(struct block_device *bdev); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
170 |
void __wait_on_buffer(struct buffer_head *); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
171 |
wait_queue_head_t *bh_waitq_head(struct buffer_head *bh); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
172 |
int fsync_bdev(struct block_device *); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
173 |
struct super_block *freeze_bdev(struct block_device *); |
2 | 174 |
int thaw_bdev(struct block_device *, struct super_block *); |
0
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|
175 |
int fsync_super(struct super_block *); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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|
176 |
int fsync_no_super(struct block_device *); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
177 |
struct buffer_head *__find_get_block(struct block_device *bdev, sector_t block, |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
178 |
unsigned size); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
179 |
struct buffer_head *__getblk(struct block_device *bdev, sector_t block, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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|
180 |
unsigned size); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
181 |
void __brelse(struct buffer_head *); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
182 |
void __bforget(struct buffer_head *); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
183 |
void __breadahead(struct block_device *, sector_t block, unsigned int size); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
184 |
struct buffer_head *__bread(struct block_device *, sector_t block, unsigned size); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
185 |
void invalidate_bh_lrus(void); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
186 |
struct buffer_head *alloc_buffer_head(gfp_t gfp_flags); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
187 |
void free_buffer_head(struct buffer_head * bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
188 |
void unlock_buffer(struct buffer_head *bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
189 |
void __lock_buffer(struct buffer_head *bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
190 |
void ll_rw_block(int, int, struct buffer_head * bh[]); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
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|
191 |
int sync_dirty_buffer(struct buffer_head *bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
192 |
int submit_bh(int, struct buffer_head *); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
193 |
void write_boundary_block(struct block_device *bdev, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
194 |
sector_t bblock, unsigned blocksize); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
195 |
int bh_uptodate_or_lock(struct buffer_head *bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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|
196 |
int bh_submit_read(struct buffer_head *bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
197 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
198 |
extern int buffer_heads_over_limit; |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
199 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
200 |
/* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
201 |
* Generic address_space_operations implementations for buffer_head-backed |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
202 |
* address_spaces. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
203 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
204 |
void block_invalidatepage(struct page *page, unsigned long offset); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
205 |
int block_write_full_page(struct page *page, get_block_t *get_block, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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|
206 |
struct writeback_control *wbc); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
207 |
int block_read_full_page(struct page*, get_block_t*); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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changeset
|
208 |
int block_is_partially_uptodate(struct page *page, read_descriptor_t *desc, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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|
209 |
unsigned long from); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
210 |
int block_write_begin(struct file *, struct address_space *, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
211 |
loff_t, unsigned, unsigned, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
212 |
struct page **, void **, get_block_t*); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
213 |
int block_write_end(struct file *, struct address_space *, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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|
214 |
loff_t, unsigned, unsigned, |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
215 |
struct page *, void *); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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changeset
|
216 |
int generic_write_end(struct file *, struct address_space *, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
217 |
loff_t, unsigned, unsigned, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
218 |
struct page *, void *); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
219 |
void page_zero_new_buffers(struct page *page, unsigned from, unsigned to); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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|
220 |
int block_prepare_write(struct page*, unsigned, unsigned, get_block_t*); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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|
221 |
int cont_write_begin(struct file *, struct address_space *, loff_t, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
222 |
unsigned, unsigned, struct page **, void **, |
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223 |
get_block_t *, loff_t *); |
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224 |
int generic_cont_expand_simple(struct inode *inode, loff_t size); |
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225 |
int block_commit_write(struct page *page, unsigned from, unsigned to); |
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226 |
int block_page_mkwrite(struct vm_area_struct *vma, struct page *page, |
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227 |
get_block_t get_block); |
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void block_sync_page(struct page *); |
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229 |
sector_t generic_block_bmap(struct address_space *, sector_t, get_block_t *); |
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230 |
int block_truncate_page(struct address_space *, loff_t, get_block_t *); |
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231 |
int file_fsync(struct file *, struct dentry *, int); |
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232 |
int nobh_write_begin(struct file *, struct address_space *, |
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233 |
loff_t, unsigned, unsigned, |
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234 |
struct page **, void **, get_block_t*); |
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235 |
int nobh_write_end(struct file *, struct address_space *, |
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236 |
loff_t, unsigned, unsigned, |
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237 |
struct page *, void *); |
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238 |
int nobh_truncate_page(struct address_space *, loff_t, get_block_t *); |
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239 |
int nobh_writepage(struct page *page, get_block_t *get_block, |
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240 |
struct writeback_control *wbc); |
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241 |
|
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242 |
void buffer_init(void); |
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243 |
|
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244 |
/* |
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245 |
* inline definitions |
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246 |
*/ |
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247 |
|
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248 |
static inline void attach_page_buffers(struct page *page, |
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249 |
struct buffer_head *head) |
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250 |
{ |
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|
251 |
page_cache_get(page); |
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252 |
SetPagePrivate(page); |
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253 |
set_page_private(page, (unsigned long)head); |
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254 |
} |
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255 |
|
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256 |
static inline void get_bh(struct buffer_head *bh) |
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257 |
{ |
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|
258 |
atomic_inc(&bh->b_count); |
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|
259 |
} |
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260 |
|
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|
261 |
static inline void put_bh(struct buffer_head *bh) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
262 |
{ |
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|
263 |
smp_mb__before_atomic_dec(); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
264 |
atomic_dec(&bh->b_count); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
265 |
} |
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|
266 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
267 |
static inline void brelse(struct buffer_head *bh) |
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|
268 |
{ |
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269 |
if (bh) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
270 |
__brelse(bh); |
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|
271 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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272 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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273 |
static inline void bforget(struct buffer_head *bh) |
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|
274 |
{ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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275 |
if (bh) |
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|
276 |
__bforget(bh); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
277 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
278 |
|
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|
279 |
static inline struct buffer_head * |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
280 |
sb_bread(struct super_block *sb, sector_t block) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
281 |
{ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
282 |
return __bread(sb->s_bdev, block, sb->s_blocksize); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
283 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
284 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
285 |
static inline void |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
286 |
sb_breadahead(struct super_block *sb, sector_t block) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
287 |
{ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
288 |
__breadahead(sb->s_bdev, block, sb->s_blocksize); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
289 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
290 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
291 |
static inline struct buffer_head * |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
292 |
sb_getblk(struct super_block *sb, sector_t block) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
293 |
{ |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
294 |
return __getblk(sb->s_bdev, block, sb->s_blocksize); |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
295 |
} |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
296 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
297 |
static inline struct buffer_head * |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
298 |
sb_find_get_block(struct super_block *sb, sector_t block) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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changeset
|
299 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
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|
300 |
return __find_get_block(sb->s_bdev, block, sb->s_blocksize); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
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|
301 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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|
302 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
303 |
static inline void |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
304 |
map_bh(struct buffer_head *bh, struct super_block *sb, sector_t block) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
305 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
306 |
set_buffer_mapped(bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
307 |
bh->b_bdev = sb->s_bdev; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
308 |
bh->b_blocknr = block; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
309 |
bh->b_size = sb->s_blocksize; |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
310 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
311 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
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|
312 |
/* |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
313 |
* Calling wait_on_buffer() for a zero-ref buffer is illegal, so we call into |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
314 |
* __wait_on_buffer() just to trip a debug check. Because debug code in inline |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
315 |
* functions is bloaty. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
316 |
*/ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
317 |
static inline void wait_on_buffer(struct buffer_head *bh) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
diff
changeset
|
318 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
319 |
might_sleep(); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
320 |
if (buffer_locked(bh) || atomic_read(&bh->b_count) == 0) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
321 |
__wait_on_buffer(bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
322 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
323 |
|
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Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
324 |
static inline int trylock_buffer(struct buffer_head *bh) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
325 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
326 |
return likely(!test_and_set_bit_lock(BH_Lock, &bh->b_state)); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
327 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
328 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
329 |
static inline void lock_buffer(struct buffer_head *bh) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
330 |
{ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
331 |
might_sleep(); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
332 |
if (!trylock_buffer(bh)) |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
333 |
__lock_buffer(bh); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
334 |
} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
335 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
336 |
extern int __set_page_dirty_buffers(struct page *page); |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
337 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
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338 |
#else /* CONFIG_BLOCK */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
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changeset
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339 |
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aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
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340 |
static inline void buffer_init(void) {} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
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341 |
static inline int try_to_free_buffers(struct page *page) { return 1; } |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
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342 |
static inline int sync_blockdev(struct block_device *bdev) { return 0; } |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
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343 |
static inline int inode_has_buffers(struct inode *inode) { return 0; } |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
344 |
static inline void invalidate_inode_buffers(struct inode *inode) {} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
345 |
static inline int remove_inode_buffers(struct inode *inode) { return 1; } |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
346 |
static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; } |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
347 |
static inline void invalidate_bdev(struct block_device *bdev) {} |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
348 |
|
2 | 349 |
static inline struct super_block *freeze_bdev(struct block_device *sb) |
350 |
{ |
|
351 |
return NULL; |
|
352 |
} |
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353 |
||
354 |
static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) |
|
355 |
{ |
|
356 |
return 0; |
|
357 |
} |
|
0
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
358 |
|
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
359 |
#endif /* CONFIG_BLOCK */ |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
Florian Westphal <fw@strlen.de>
parents:
diff
changeset
|
360 |
#endif /* _LINUX_BUFFER_HEAD_H */ |